Structure for sliding rail of drawers

ABSTRACT

A structure improvement for sliding rail of drawers with longer life cycle and extendable length, mainly containing an outer sliding rail, an inner sliding rail, and a steelball-sliding sheet placed between the outer sliding rail and the inner sliding rail to guide the inner sliding rail to move freely. A rolling bearing is installed on the embedding end of the sliding rail, inside the inner groove of the outer sliding rail, so as to guide the movement inner sliding rail. With the rolling bearing against the top and the bottom retaining sheets of the inner groove, the steelball-sliding sheet and the rolling bearing provides multi-point support to resists against the moment of force. Shortening the steelball-sliding sheet&#39;s length increases extendable length of the inner sliding rail to the extend of full expansion, thus enhance the life cycle and the extendable length of the drawers.

FIELD OF THE INVENTION

[0001] The present invention relates to a structure sliding rail ofdrawers, especially the one with longer life cycle and extendablelength.

BACKGROUND OF THE INVENTION

[0002] As shown in FIG. 1 and FIG. 2. Traditional sliding rail ofdrawers containers an outer sliding rail 1′, an inner sliding rail 2′and a steelball-sliding sheet 3′. The inner rail 2′ is placed in theinner groove 11′ of the outer sliding rail 1′ while thesteelball-sliding sheet 3′ is placed between the outer sliding rail 1and the inner sliding rail 2′, guiding the movement of the inner slidingrail 2′, thus makes it move freely inside the inner groove 11′ of theouter sliding rail 1′.

[0003] However, when the inner sliding rail 2′ extends, thesheetball-sliding sheet 3′ placed between the outer sliding rail 1′ andthe inner sliding rail 2′ would move along with the inner sliding rail2′ and stop at the front end of the outer sliding rail 1′. The length Lof the steelball-sliding sheet 3′ is limited with certain mechanism thatresists the moment of force at the intersection of the fully-expandedinner sliding rail 2′ and the outer sliding rail 1′. Otherwise, thesteelball-sliding sheet 3′ failing to resist the moment of force wouldcause distortion of the two retaining sheets 12′ on the inner groove 11′of the outer sliding rail 1′, even cause the two retaining sheets 12′ tostretch outward, thus make the inner rail 2′ and the steelball-slidingsheet 3′ fall off.

[0004] Furthermore, the length L of the steelball-sliding sheet 3′ isrestricted by the length expansion criterion and the section area of theouter sliding rail 1′ and the inner sliding rail 2′; therefore thelength expansion of the steelball-sliding sheet 3′ and the inner slidingrail 2′ is limited and prevents the inner sliding rail 2′ from fullyextending.

[0005] Moreover, the extension and movement of the inner sliding rail 2′depend on the guiding of the steelball-sliding sheet 3′ and the momentof force at the intersection of the inner sliding rail 2′ and the outersliding rail 1′. The repeated pulling and gliding for a long time wouldcause the steelball sliding sheet 3′ to wear down faster than the outersliding rail 1′ and the inner sliding rail 2′, and influences the lifecycle of the sliding rail of drawers.

SUMMARY OF THE INVENTION

[0006] In view of such demerits, the inventor of the present inventionwas devoted to finding a solution and accomplished structure for slidingrail of drawers with longer life cycle and extendable length.

[0007] The main objective for the present invention is to install arolling bearing on the embedding end of the sliding rail. The rollingbearing placed inside the inner groove of the outer sliding rail guidesthe movement inner sliding rail inserted to the outer sliding rail. Inthis way, when the inner sliding rail extends and moves, thesteelball-sliding sheet can guide the rail with the assistance of therolling bearing so as to provide multi-point support for the extensionand movement of the inner sliding rail. Moreover, by placing the rollingbearing on the embedding end of the outer sliding rail, a length of thefully-expanding inner sliding rail's end remains at the embedding end ofthe outer sliding rail, and the rolling bearing leans against the topand the bottom retaining sheets of the inner groove; therefore theresistance against the moment of force at the intersection of the innersliding rail and the outer sliding rail is strengthened and give therolling bearing and steelball-sliding sheets the ability of restrictingmulti-point supports. The moment of force imposed on thesteelball-sliding sheets is reduced and thus enlarge its life cycle,which in turn extend the life cycle of the sliding rails of drawers.

[0008] Another objective for the present invention is to provide astructure that assists the guiding of the steelball-sliding sheets andthe resistance against the moment of force. This mechanism shortens thelength of the steelball-sliding sheet, increasing the extendable lengthof the inner sliding rail to the extend of full expansion. Consequently,the area of the drawer being opened is larger than it used to be andenhances usability.

[0009] In the following, the embodiment illustrated is used to describethe detailed structural characteristics and operation action for thepresent invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010]FIG. 1 is an illustration for the structural appearance oftraditional sliding rails of drawers.

[0011]FIG. 2 is a lateral illustration for formation of the traditionalsliding rails of drawers.

[0012]FIG. 3 is an illustration for the structural appearance of thepresent invention.

[0013]FIG. 4 is a three-dimensional illustration for formation of thesliding rails of drawers for the present invention.

[0014]FIG. 5 is a lateral illustration for formation of the slidingrails of drawers for the present invention.

[0015]FIG. 6 is an illustration about the present invention applied tothree-phase sliding rails of drawers.

DETAILED DESCRIPTION OF THE INVENTION

[0016] Please refer to FIG. 3. The sliding rail of drawers for thepresent invention containers an outer sliding rail 1, an inner slidingrail 2 and a steelball-sliding sheet 3. The inner rail 2 is placed inthe inner groove 11 of the outer sliding rail 1 while thesteelball-sliding sheet 3 is placed between the outer sliding rail 1 andthe inner sliding rail 2, guiding the movement of the inner sliding rail2, thus makes it move freely. inside the inner groove II of the outersliding rail 1.

[0017] A rolling bearing 13 placed is installed at the embedding end 13of the outer sliding rail 1. The rolling bearing 13 placed inside theinner groove of the outer sliding rail 1 helps guide the movement innersliding rail 2 inserted to the outer sliding rail. The edge 131 of therolling bearing 13 leans against the top retaining sheet 211 and thebottom retaining sheet 212 on the inner groove 21 of the inner slidingrail 2 to act as guide assistance (refer to FIG. 4 and FIG. 5).

[0018] In this way, when the inner sliding rail 2 extends and moves, thesteelball-sliding sheet 3 can guide the rail with the assistance of therolling bearing 13 so that the extension and movement of the innersliding rail supports multi-point movement. Moreover, by placing therolling bearing 13 on the embedding end 12 of the outer sliding rail, alength of the fully-expanding inner sliding rail 2 remains at theembedding end 12 of the outer sliding rail 1; therefore the resistanceagainst the moment of force at the intersection of the inner slidingrail 2 and the outer sliding rail 1 is strengthened and the moment offorce is restricted by multi-point supports formed by the rollingbearing 13 and steelball-sliding sheets 3, enhancing the life cycle ofthe drawer.

[0019] Compared the existing drawers with the same length ofsteelball-sliding sheet 3, the present invention's rolling bearing atthe embedding end 12 of the outer sliding rail 1, even being pulled anddragged repeatedly, has a life cycle 4 times greater than existingdrawers.

[0020] Moreover, the rolling bearing 13 at the embedding end 12 of theouter sliding rail 1 assists the guiding of the steelball-sliding sheet3 as well as resists the moment of force, shortening the length of thesteelball-sliding sheet 3, thus increases the extendable length of theinner sliding rail 2 to the extend of full expansion. Consequently, thearea of the drawer being opened is larger than it used to be andenhances usability.

[0021] The above present invention describes two-phase drawers withlonger life cycle and extendable length. A three-phase drawer isillustrated as FIG. 6, wherein the outer sliding rail 1 is used as amiddle sliding rail, with is an extending outer sliding rail coveredupon its inner groove 11. A steelball-sliding sheet 5 is covered on theouter sliding rail 1 and the extending outer sliding rail 4 to guide themovement of the outer sliding rail 1, allowing the inner groove 41 ofthe extending outer sliding rail 4 to move freely, thus enlarge thedrawer's life cycle and extendable length.

[0022] To summarize the above description, the sliding rail in thepresent invention can provide effective performance and extend its lifethrough a simple structure, which practically meets the qualificationsfor invention based on new type and improvement. Accordingly, anapplication is submitted for examination.

What is claimed is:
 1. A structure for sliding rail of drawers,containing an outer sliding rail, an inner sliding rail and asteelball-sliding sheet with said steelball-sliding sheet placed betweensaid outer sliding rail and said inner sliding rail guiding said innersliding rail to move freely, characterized in that: a rolling bearing isinstalled at an embedding end of said outer sliding rail and inside aninner groove of said outer sliding rail, so as to guide movement of saidinner sliding rail; an edge of said rolling bearing leans against a topand a bottom retaining sheets on an inner groove of said inner slidingrail; said steelball-sliding sheet and said rolling bearing help guidingmovement of said inner sliding rail and said rolling bearing enhancesresistance against moment of force at one end of said inner sliding railwhile forming multi-point support; by shortening length of saidsteelball-sliding sheet, drawers' life cycle and extendable length areboth enhanced.